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Bohn, B. [Author]; Corlett, G.K. [Author]; Dorn, H.-P. [Author]; Monks, P. S. [Author]; Platt, U. [Author]; Plass-Dülmer, C. [Author]; Mihalopoulos, N. [Author]; Heard, D. E. [Author]; Clemitshaw, K. C. [Author]; Meixner, F. X. [Author]; Prevot, A. S. H. [Author]; Schmitt, R. [Author]; Gillmann, M. [Author]; Sanghavi, S. [Author]; Stange, G. [Author]; Tensing, E. [Author]; Vrekoussis, M. [Author]; Bloss, W. J. [Author]; Clapp, L.J. [Author]; Kortner, M. [Author]

Photolysis frequency measurement techniques: results of a comparison within the ACCENT project

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  • Media type: E-Article
  • Title: Photolysis frequency measurement techniques: results of a comparison within the ACCENT project
  • Contributor: Bohn, B. [Author]; Corlett, G.K. [Author]; Dorn, H.-P. [Author]; Monks, P. S. [Author]; Platt, U. [Author]; Plass-Dülmer, C. [Author]; Mihalopoulos, N. [Author]; Heard, D. E. [Author]; Clemitshaw, K. C. [Author]; Meixner, F. X. [Author]; Prevot, A. S. H. [Author]; Schmitt, R. [Author]; Gillmann, M. [Author]; Sanghavi, S. [Author]; Stange, G. [Author]; Tensing, E. [Author]; Vrekoussis, M. [Author]; Bloss, W. J. [Author]; Clapp, L.J. [Author]; Kortner, M. [Author]
  • Published: EGU, 2008
  • Published in: Atmospheric chemistry and physics 8, 5373 - 5391 (2008). doi:10.5194/acp-8-5373-2008
  • Language: English
  • DOI: https://doi.org/10.5194/acp-8-5373-2008
  • ISSN: 1680-7316
  • Keywords:
  • Origination:
  • Footnote: Diese Datenquelle enthält auch Bestandsnachweise, die nicht zu einem Volltext führen.
  • Description: An intercomparison of different radiometric techniques measuring atmospheric photolysis frequencies j(NO2), j(HCHO) and j((OD)-D-1) was carried out in a two-week field campaign in June 2005 at Julich. Germany. Three double-monochromator based spectroradiometers (DM-SR), three single-monochromator based spectroradiometers with diode-array detectors (SM-SR) and seventeen filter radiometers (FR) (ten j(NO2))-FR, seven j((OD)-D-1)-FR) took part in this comparison. For j(NO2), all spectroradiometer results agreed within +/- 3%. For j(HCHO), agreement was slightly poorer between -8% and +4% of the DM-SR reference result. For the SM-SR deviations were explained by poorer spectral resolutions and lower accuracies caused by decreased sensitivities of the photodiode arrays in a wave-length range below 350 nm. For j((OD)-D-1), the results were more complex within +8% and -4% with increasing deviations towards larger solar zenith angles for the SM-SR. The direction and the magnitude of the deviations were dependent on the technique of background determination. All j(NO2))-FR showed good linearity with sing-le calibration factors being sufficient to convert from output voltages to j(NO2)). Measurements were feasible until sunset and comparison with previous calibrations showed good long-term stability. For the j((OD)-D-1)-FR, conversion from output voltages to j((OD)-D-1) needed calibration factors and correction functions considering the influences of total ozone column and elevation of the sun. All instruments showed good linearity at photolysis frequencies exceeding about 10% of maximum values. At larger solar zenith angles, the agreement was non-uniform with deviations explainable by insufficient correction functions. Comparison with previous calibrations for sonic J((OD)-D-1)-FR indicated drifts of calibration factors.
  • Access State: Open Access